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Buy Wholesale and maintain an Active status for 2 months and we will refund your $39 Distributor Fee
11-SEPTEMBER-2008 13:54:10 - Biogeochemical cycle January 2008 In ecology and Earth science, a biogeochemical cycle is a circuit or pathway by which a chemical element or molecule moves through both biotic bio- and abiotic geo- compartments of an ecosystem. In effect, the element is recycled, although in some such cycles there may be places called sinks where the element is accumulated or held for a long period of time. The elements, chemical compounds, and other forms of matter are passed from one organism to another and from one part of the biosphere to another through the biogeochemical cycles.1 All chemical elements occurring in organisms are part of biogeochemical cycles. In addition to being a part of living organisms, these chemical elements also cycle through abiotic factors of ecosystems such as water hydrosphere, land lithosphere, and the air atmosphere; the living factors of the planet can be referred to collectively as the biosphere. All the chemicals, nutrients, or elements - such as carbon, nitrogen, oxygen, phosphorus - used in ecosystems by living organisms operate on a closed system, which refers to the fact that these chemicals are recycled instead of being lost and replenished constantly such as in an open system. The energy of an ecosystem occurs on an open system; the sun constantly gives the planet energy in the form of light while it is eventually used and lost in the form of heat throughout the trophic levels of a food web. The Earth does not constantly receive more chemicals as it receives light; it has only those from which it formed, and the only way to obtain more chemicals or nutrients is from occasional meteorites from outer space. Because chemicals operate on a closed system and cannot be lost and replenished like energy can, these chemicals must be recycled throughout all of Earth's processes that use those chemicals or elements. These cycles include both the living biosphere, and the nonliving lithosphere, atmosphere, and hydrosphere. The term biogeochemical takes its prefixes from these cycles: Bio refers to the biosphere. Geo refers collectively to the lithosphere, atmosphere, and hydrosphere. Chemical, of course, refers to the chemicals that go through the cycle. The chemicals are sometimes held for long periods of time in one place. This place is called a reservoir, which, for example, includes such things as coal deposits that are storing carbon for a long period of time. When chemicals are held for only short periods of time, they are being held in exchange pools. Generally, reservoirs are abiotic factors while exchange pools are biotic factors. Examples of exchange pools include plants and animals, which temporarily use carbon in their systems and release it back into the air or surrounding medium. Carbon is held for a relatively short time in plants and animals when compared to coal deposits. The amount of time that a chemical is held in one place is called its residence. The most well-known and important biogeochemical cycles, for example, include the carbon cycle, the nitrogen cycle, the oxygen cycle, the phosphorus cycle, and the water cycle. Biogeochemical cycles always involve equilibrium states: a balance in the cycling of the element between compartments. However, overall balance may involve compartments distributed on a global scale. Biogeochemical cycles of particular interest in ecology are: nitrogen cycle oxygen cycle carbon cycle sulfur cycle water cycle hydrogen cycle References ^ Prentice Hall Biology Retrieved from http://en..org/wiki/Biogeochemical_cycle Categories: Ecological cycles | Geochemistry | BiogeographyHidden categories: Articles lacking sources from January 2008 | All articles lacking sources Views Article Discussion this page History Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Go Search Interaction Community portal Recent changes Contact Donate to Help Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this page Languages ÄŒesky Dansk Eesti Español Français Italiano Nederlands Português Svenska ไทย УкраїнÑ?ька ä¸æ–‡ This page was last modified on 8 September 2008, at 22:38
39 Reasons to Drink Acai Juice Every Day
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Discovering MonaVie Video
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Effects of MonaVie Active on Antioxidant Capacity in Humans
So many of us do not eat a balanced diet, get enough sleep, have too much stress, or are impacted with toxins and pollutants. Drinking 2 ounces of MonaVie twice a day will help your body detoxify as well as build your immune system. Its the smartest thing you can do for yourself, so start today. Buying MonaVie through our company guarantees you support 7 days a week and, if you would like to share MonaVie with your family and friends we will guide you from start to finish.
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